f(x) = (x-1) / (x+1)
f((x-1) / (x+1)) = [ (x-1) / (x+1) - 1] / [(x-1) / (x+1) + 1]
= [-2 / (x+1)] / [2x / (x+1)]
= -2 / (2x) = -1/x
Mark M.
tutor
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09/16/18
Mark M.
tutor
In the first step, each x in f(x) = (x-1) / (x+1) was replaced by (x-1) / (x+1).
In the next step, I simplified each expression in [ ] by finding the common denominator and adding or subtracting the resulting rational expressions.
Divide the resulting rational expressions and simplify to get the answer.
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09/16/18
Alissa G.
09/16/18